[ sandwichfarm/nostr-watch ] Enhance/docker images (#843)

* improve naming conventions, prepare for deployments

* resolve conflicts from stale pointers

* add clearnet/multinet[suite] dockerfiles, add envvar override for composable docker-compose

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https://github.com/sandwichfarm/nostr-watch/commit/b0fd98eab0b90786c78bfe00f8eb3563b318adbc